Set Operation 
The Set Operation menu item is used to perform standard set operations on closed geometry objects (grids, meshes, and polygons). The result of this operation is always one or more polygons, unless the operation generates no output at all; for example, the intersection of two nonoverlapping polygons would generate an empty polygon.
If the set operation generates more than one polygon, the output will be placed in a new folder.
Select the objects to be used for input from the Subject List and the Clip List.
Set Operation
Select the desired set operation here.
Z Values
Any set operation could generate new data points. Use this setting to determine how their elevations are calculated.
Extra Points
The output polygons from a set operation can be simplified based on their geometry; for example, the line (0,0), (0,2), (0,4) does not need to keep (0,2) because the two segments are parallel and share a common point.
